CVE-2026-4342: Kubernetes Nginx Ingress Controller

High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days.

A security issue was discovered in ingress-nginx where a combination of Ingress annotations can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the controller. (Note that in the default installation, the controller can access all Secrets cluster-wide.)

Affected products

• Kubernetes Nginx Ingress Controller: before 1.13.9 (fixed in 1.13.9); from 1.14.0, before 1.14.5 (fixed in 1.14.5); version 1.15.0 only

Published 2026-03-19. Last modified 2026-06-17.